EP13 - The Hidden Air That Fish Breathe — and Why Rivers Are Running Low episode artwork

EPISODE · May 20, 2026 · 6 MIN

EP13 - The Hidden Air That Fish Breathe — and Why Rivers Are Running Low

from Big World, Little Ears · host Hippo Tom

Did you know fish breathe oxygen just like you do — except theirs is hidden inside water? This episode explores why scientists are discovering that rivers around the world are quietly losing the invisible oxygen that fish and river creatures need to survive. We follow the science from curious researchers to the hidden world beneath the river's surface, and find out why healthy rivers matter to every family on Earth. 🔬 Learn what dissolved oxygen is and why cold water holds more of it. 🌿 Discover how tiny algae can change an entire river ecosystem. 🐟 Find out how rivers have healed before — and can again. 💬 Ask your child: if fish breathe water the way we breathe air, what other amazing things might animals do that we haven't discovered yet?

Episode metadata supplied by the publisher feed · Published May 20, 2026

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EP13 - The Hidden Air That Fish Breathe — and Why Rivers Are Running Low

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